基于离散元的重载铁路有砟轨道阻力特性研究
Research on the Resistance Characteristics of Ballasted Track of Heavy Haul Railway Based on Discrete Element Method
刘文硕 1夏栋文 2赖豪 1曾志平 1吕方舟1
作者信息
- 1. 中南大学,长沙 410075
- 2. 中机国际工程设计研究院有限责任公司,长沙 410021
- 折叠
摘要
研究目的:有砟轨道在重载铁路中广泛采用,随着服役时间的增加,在列车荷载反复作用下,道床性能会随之变化,线路阻力呈现动态发展的时变特性.作为求解梁轨相互作用的关键,准确合理地选取线路纵向阻力是保证梁轨相互作用计算准确的前提,关系梁轨系统的正常使用与安全运营.研究结论:(1)颗粒级配由粗到细,纵向线阻力逐渐减小;摩擦系数由小到大,纵向线阻力稍微增加;(2)结合不同级配建立的道床模型模拟出的纵向线阻力-位移曲线,获得纵向线阻力动态演化模型,可知线路纵向阻力由新建线路的阻力29.7 kN/(m·线)演化到破碎充分时的23.6 kN/(m·线),退化幅度约为20.5%;(3)本研究成果可为开展全服役期内重载铁路的梁轨相互作用等相关研究提供关键参数.
Abstract
Research purposes:Ballasted tracks are widely used in heavy haul railway.As the service time increases,the performance of the line resistance presents a dynamic evolution characteristic.As the key to solve the beam-track interaction,the selection of reasonable and accurate longitudinal line resistance is a prerequisite to ensure the accuracy and reliability of the calculation results of the beam-track interaction,which is related to the normal use and safe operation of the beam-track system.Research conclusions:(1)The longitudinal line resistance decreases gradually with the grain gradation from coarse to fine,and increases gradually with the friction coefficient from small to large.(2)The dynamic evolution model of longitudinal line resistance is obtained by combining the longitudinal line resistance displacement curve simulated by the ballast bed model established by different gradation.It can be seen that the longitudinal line resistance evolves from 29.7 kN/m/line of the new line to 23.6 kN/m/line of the fully broken line and the degradation is about 20.5%.(3)The research results can provide key parameters for the study of beam-track interaction of heavy-haul railways during the full service period.
关键词
线路阻力/有砟轨道/离散元法/道砟级配/时变特性Key words
line resistance/ballasted track/discrete element method/ballast graduation/time-varying characteristics引用本文复制引用
基金项目
国家自然科学基金(51708560)
国家自然科学基金(52278234)
湖南省自然科学基金(2022JJ30728)
出版年
2024
NETL
NSTL
万方数据